RE: Trying to compile Python 3.5 on Linux Mint 19, getting compiler warnings and failing tests

Hmm. From looking at your full log (THANK YOU for posting that, btw - so many people don't), it looks like an issue with certificate checking. Might be a bug in the test itself. Does the same thing happen with a more recent Python build? It could be a weirdness with specific versions of OpenSSL.

Trying to compile Python 3.5 on Linux Mint 19, getting compiler warnings and failing tests

My boss wants my code to run on Python 3.5, so I thought I'd install 3.5 to be able to ascertain this. But Linux Mint 19 ships with Python 3.6 and python.org only provides source code for 3.5.6. So I thought I'd try compiling 3.5.6 myself.